Office (OLE) / .XLS malware analysis — malicious · 636dc46e6449b969

MALICIOUS

Office (OLE) / .XLS

425.5 KB Created: 2020-09-20 21:17:44

MD5: 00769fef65f1534850ead16d7ee045f1 SHA-1: 54831a3d06ce8df4d9a4ee14a93574c5af34bd61 SHA-256: 636dc46e6449b96938107562c326db292910378eed258a24f8a846c0db54401e

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 macros that are configured to auto-execute upon opening. The macros utilize PowerShell commands to download a file named 'kc.exe' from 'https://cutt.ly/DgwXCmM' and then execute it from the user's application data directory. This indicates a downloader or dropper functionality.

Heuristics 5

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `2770b99227e8aaa87ab93b19ac852d788cf3125ea7031f4340961201ea872895`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	813 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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